Figure 2.

The combined network in H. pylori. The networks of the three individual methods (shown in Figure 1) are superimposed. Links colored yellow were obtained by phylogenetic profiling; links colored blue by conserved chromosomal proximity, and links colored red by domain fusion. The remaining links are coded as composites of the three primary colors: purple, links found by both fusion and chromosomal proximity; green, links found by chromosomal proximity and phylogenetic profiling, orange, links found by phylogenetic profiling and fusion; and brown, links found by all three methods. The nodes highlighted in red and blue identify genes that participate in oxidative phosphorylation and aromatic amino-acid biosynthesis, respectively (see Figure 4).